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United States Patent |
5,076,795
|
Krupp
,   et al.
|
December 31, 1991
|
Electrical terminal block assembly
Abstract
A support block has slots in the top and rear faces receiving bent terminal
strips. Protrusions on the strips abut a forward or downwardly facing
surface at the front of the top slot. Protrusions at the other end of the
strips abut a downwardly facing surface at the bottom of the rear slot. A
terminal tip extends forwardly, and a tang for soldering into a circuit
board extends downwardly. Terminal strips without protrusions fit within
slots in the bottom face of the support block.
Inventors:
|
Krupp; Eric (Canton, MI);
Tinder; Dave (Dearborn, MI)
|
Assignee:
|
United Technologies Automotive, Inc. (Dearborn, MI)
|
Appl. No.:
|
633698 |
Filed:
|
December 24, 1990 |
Current U.S. Class: |
439/79; 439/80; 439/83; 439/876 |
Intern'l Class: |
H01R 009/09 |
Field of Search: |
439/79-83,876,873,676
|
References Cited
U.S. Patent Documents
4292736 | Oct., 1981 | Hughes et al. | 439/79.
|
4907978 | Mar., 1990 | Bowen | 439/79.
|
Foreign Patent Documents |
2278220 | Feb., 1976 | FR | 439/79.
|
Primary Examiner: Bradley; Paula A.
Attorney, Agent or Firm: Kochey, Jr.; Edward L.
Claims
We claim:
1. A terminal block assembly comprising:
a nonconductive elongated support block, substantially rectangular in cross
section, having top, bottom and rear faces;
a plurality of conductive terminal strips, each having a width and
thickness, and having a tang at one end for soldering into a circuit board
and a terminal tip at the other end for mating with a connector;
a plurality of top slots across said top face and a plurality of contiguous
rear slots across said rear face of said support block, of a width equal
to the width of said terminal strips;
said terminal strips bent at an angle substantially at most equal to the
angle between said top slot and said rear slot, and located in said slots,
said tang extending below said block and said terminal tip extending
beyond the front face of said block;
at least one front protrusion on each of said strips extending beyond the
width of said strip and located adjacent the front edge of said top slot;
at least one rear protrusion on each of said strips extending beyond the
width of said strip and located adjacent the bottom edge of said rear
slot;
a downward or forward facing preexisting surface on said support block
adjacent the front edge of each top slot abutting said at least one front
protrusion; and
a downward facing preexisting surface on said support block adjacent the
bottom edge of each rear slot abutting at least on of said rear
protrusion.
2. A terminal block assembly as in claim 1:
said downward or forward facing surface on said support block comprising a
downward facing surface.
3. A terminal block assembly as in claim 1 having also:
a recess in said rear face at the lower edge thereof having a top
downwardly facing surface, said top downwardly facing surface of said
recess located above the bottom of said block a distance at least equal to
the width of said at least one rear protrusion and comprising said
downward facing surface adjacent the bottom edge of each rear slot.
4. A terminal block assembly as in claim 3:
the angle between said top slots and said rear slots being substantially
90.degree..
5. A terminal block assembly as in claim 4:
there being two front protrusions on each of said strips, one extending
beyond the width of said strip on each side; and
there being two rear protrusions on each of said strips, each extending
beyond the width of said strip on each side.
6. A terminal block assembly as in claim 1:
a slot on the bottom face of said block extending from the front face
partially toward the rear face;
a lower terminal strip free of protrusions having a terminal tip at one end
for the mating with a connector and a tang at the other end for soldering
into a circuit board;
said tang bent at 90.degree. from the remainder of said terminal strip and
said lower terminal strip located within said bottom slot.
7. A terminal block assembly as in claim 6:
said lower slot having a dovetail shape whereby said lower terminal strip
is retained within said lower slot.
8. A terminal block assembly comprising:
a nonconductive elongated support block, substantially rectangular in cross
section, having top, bottom and rear faces;
a plurality of conductive terminal strips, each having the width and
thickness, and having a tang at one end for soldering into a circuit board
and a terminal tip at the other end for mating with a connector;
a plurality of top slots across said top face and a plurality of contiguous
rear slots across said rear face of said support block, of a width equal
to the width of said terminal strips;
said terminal strips bent at an angle substantially at most equal to the
angle between said top slot and said rear slot, and located in said slots,
said tang extending below said block and said terminal tip extending beyond
the front face of said block;
at least one front protrusion on each of said strips extending beyond the
width of said strip and located adjacent the front edge of said top slot;
at least one rear protrusion one each of said strips extending beyond the
width of said strip and located adjacent the bottom edge of said rear
slot;
a downward or forward facing surface on said support block adjacent the
front edge of each top slot abutting said at least one front protrusion;
and
a downward facing surface on said support block adjacent the bottom edge of
said rear slot abutting at least one of said rear protrusion;
a recess in said rear face at the lower edge thereof having a top
downwardly facing surface, said top downwardly facing surface of said
recess located above the bottom of said block a distance at least equal to
the width of said at least one rear protrusion; and
the angle between said top slot and said rear slot being less than
90.degree., whereby the location of the rear slot at the bottom of said
block is located substantially forward of said rear face.
9. A terminal block assembly as in claim 8:
there being two front protrusions on each of said strips, one extending
beyond the width of said strip on each side; and
there being two rear protrusions on each of said strips, each extending
beyond the width of said strip on each side.
Description
TECHNICAL FIELD
The invention relates to terminals stamped from flat metal and in
particular to terminals extending outwardly adjacent to a printed circuit
board.
BACKGROUND OF THE INVENTION
Connections for terminals to a printed circuit board are often arranged in
two parallel rows, one row close to the board and the other row above the
first further from the circuit board. Tight tolerances are applied to the
location of the terminals and three mutually perpendicular planes with
respect to the circuit board and to the molded connector shell which
surrounds the terminals. The angular orientation of the terminals must
also be closely controlled so that the proper fit with the mating
connector can be assured. The terminals must also be supported so as to
adequately resist the push and pull forces associated with connecting and
disconnecting the mating connector. The location and orientation of the
terminal must be maintained after assembly to the circuit board, down the
assembly conveyor, through wave soldering and through assembly into the
module housing.
Current methods of supporting such terminals involve pushing the terminals
individually or in groups, into closely fitting slots in a plastic wall.
Since both the slots and the terminals are subject to dimensional
variations, control of location and orientation is limited. Barbs on the
terminals which engage the sides of the slots are sometimes used to resist
pushout.
SUMMARY OF THE INVENTION
A substantially rectangular support block has a plurality of parallel slots
across the top and rear faces. A plurality of terminal strips with a tang
at one end and a terminal tip at the other end are bent to substantially
90.degree. to fit within the slots on the top and rear faces. Protrusions
on the front end of each terminal strip abut a forward or downward facing
surface at the front edge of the top slot. Protrusions near the bottom of
the terminal strip, but above the tang, abut downwardly facing surface
adjacent the lower edge of the slot in the rear face, with a tang
extending downwardly for soldering into a circuit board.
There may also be a bottom row of terminals free of protrusions which fit
within slots on the bottom face of the circuit board. These slots pass
from the front surface partially to the rear face, and preferably, are of
a dovetail shape to retain the terminal strip therein which in this case
is free of protrusions. The tang end of the strip is bent downwardly
90.degree. extending below the block for soldering into a circuit board.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an isometric view of a support block;
FIG. 2 is an isometric view of the terminal used for the upper row of
terminals;
FIG. 3 is a view of the lower terminal;
FIG. 4 is a section through the terminal block;
FIG. 5 is a section through the terminal block showing the terminals in
place;
FIG. 6 is a section through an alternate arrangement of the terminal block;
FIG. 7 is an isometric view of the terminal block having a downwardly
facing surface at the front edge;
FIG. 8 is a section through the terminal block of FIG. 7; and
FIG. 9 is a partial front view of FIG. 8 showing the dovetail slots.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to FIG. 1, a nonconductive elongated support block 10 is
substantially rectangular in cross section. It has a top face 12, a bottom
face 14, front face 16 and a rear face 18. A plurality of conductive
terminal strips 20 illustrated in FIG. 2 have a width W of 2.8 mm and a
thickness T of 0.8 mm. Each strip has a tang 22 at one end for soldering
into a circuit board and a terminal tip 24 at the other end for mating
with the connector. The block 16 has a plurality of top slots 26 across
the top face 12 and a plurality of rear slots 28 across the rear face 18.
These slots are each of a width equal to the width of terminal slot 20.
The terminal strip 20 is bent at an angle substantially equal to the angle
between slots 26 and 28, this being 90.degree. as illustrated. The bend in
the terminal strip 20 while substantially 90.degree. should be not be
greater than 90.degree., but preferably is slightly less than 90.degree.
which provides slight spring action to hold the strip in place.
Where a lower row of terminals is desired, lower terminal strip 30 is
supplied, the strip also having a terminal top 32 for mating with the
connector and a tang 34 for soldering into a printed circuit board. This
tang 34 is bent at 90.degree. from the remainder of the lower terminal
strip.
FIG. 4 is a section through the terminal block and it can be seen that
adjacent to the front edge of top slot 26 is a forward facing surface 36.
Also adjacent to the lower edge of rear slot 28 is a downwardly facing
surface 38.
FIG. 5 illustrates the terminal block and the terminals mounted on the
printed circuit board 40.
Front protrusions 23 are located on each of the strips extending beyond the
width of the strip at a location such that when the strip is installed
they will be adjacent to the edge of the top slot. Rear protrusions 25 on
each of the strips extend beyond the edge of the strip and are located so
that when installed they will be adjacent to the bottom edge of the rear
slot.
Terminal strip 20 is installed with the front protrusions abutting the
forward facing surface 36 at the top slot. The terminal strip is then
rotated so that protrusions 25 snap under the downward facing surface 38
of the rear slot leaving tang 22 extending downwardly below the bottom
face 14 of the block. The terminal strip is held into place by the
interaction between protrusions 23 on surface 36 as well as protrusions 25
on surface 38. For this reason the terminal strips are bent at an angle
substantially most equal to the angle between the top slot and the rear
slot so that the stiffness of the terminal tends to retain the terminal
against the top and rear surfaces. An upward force against the terminal
tip 24 is resisted in movement by the stiffness of terminal 20. Prior to
soldering into the circuit board the entire terminal could rotate around
surface 38, but in doing so there is a rearward component of the motion of
tang 23 which causes interference against surface 36.
A second row of terminals close to the circuit board 40 may be supplied
with lower terminal strip 30 fitting within slot 42 with a bottom face 14
of the support block. This slot extends from the front face 16 only
partially to the rear face. The terminals then may be wave soldered
producing solder joints 44 securing the terminals to the circuit board 40.
FIG. 6 illustrates alternate embodiment where the rear slot 28 is at an
angle less than 90.degree. from the top slot 26. Terminal 20 is bent at a
similar angle. Lower tangs 25 on the terminal strip are located a
substantial distance from the rear of the block so that the tip 24 in
moving upwardly can only move in arc 46 around the protrusions 25. This
increases the interference against surface 36 further resisting upward
movement of the terminal tips.
FIG. 7 illustrates an alternate embodiment with increased resistance to
lifting of the terminal. A plurality of projections 50 are located on the
top face near the front edge of the block. These extend over the area of
protrusion so that a downwardly facing surface 52 is achieved.
Installation of terminal strip 20 requires first inserting the protrusions
23 under the surface 52 and rotating the protrusions 25 so that they
interlock against surface 38. Increased resistance against lifting of
terminal tip 24 is thereby achieved.
In the previous embodiment the lower terminals 30 are not securely held in
the block prior to soldering the terminal. In the embodiment shown in
FIGS. 7, 8 and 9 slot 14 has oblique sides 54 forming a dovetail shape 56.
Terminal 30 is slid into slot 14 with the upper portion of the bent tang
34 abutting the rear surface 58 of the slot. Terminal slot 30 is thereby
held in the terminal block in preparation for installation on the circuit
board and soldering of the tangs.
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